A 25-year-old sustains a blow to the left cheek. He develops diplopia on upward gaze, enophthalmos, and hypoesthesia below the left eye. CT shows a 'trapdoor' type fracture of the orbital floor. What is the most important immediate surgical indication?
- A Muscle entrapment (inferior rectus/oblique) with ischemia producing restriction of upgaze and oculocardiac reflex (nausea and bradycardia) ✓
- B Pure enophthalmos of 3 mm without functional symptoms
- C Infraorbital nerve hypoesthesia alone
- D Small orbital floor defect with less than 1 mm enophthalmos
Correct answer: A. Muscle entrapment (inferior rectus/oblique) with ischemia producing restriction of upgaze and oculocardiac reflex (nausea and bradycardia)
Explanation
Trapdoor orbital floor fractures (more common in children and young adults due to elastic bone) can entrap the inferior rectus or inferior oblique muscle within the fracture, causing ischemia. The oculocardiac reflex (nausea, vomiting, bradycardia, and syncope) due to traction on the extraocular muscle indicates a true surgical emergency requiring prompt decompression within 24–48 hours to prevent permanent diplopia and muscle fibrosis. Enophthalmos alone (without entrapment) and infraorbital hypoesthesia are indications for semi-elective repair.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
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Written and medically reviewed by the StethoPrep medical team.